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https://hdl.handle.net/2440/74790
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Type: | Journal article |
Title: | Reaction pathways, activation energies and mechanical properties of hybridcomposites synthesized in-situ from Al-TiO₂-C powder mixtures |
Other Titles: | Reaction pathways, activation energies and mechanical properties of hybridcomposites synthesized in-situ from Al-TiO(2)-C powder mixtures |
Author: | Zhu, H. Jiang, Y. Yao, Y. Song, J. Li, J. Xie, Z. |
Citation: | Materials Chemistry and Physics, 2012; 137(2):532-542 |
Publisher: | Elsevier Science SA |
Issue Date: | 2012 |
ISSN: | 0254-0584 1879-3312 |
Statement of Responsibility: | Heguo Zhu, Yalin Jiang, Yinqun Yao, Jinzhu Song, Jianliang Li, Zonghan Xie |
Abstract: | In-situ aluminum matrix composites were fabricated from Al-TiO 2-graphitic C powder mixtures using exothermic dispersion method. The effects of C/TiO2 molar ratio on the reaction processes, activation energies and mechanical properties of the resulting materials were investigated. When the C/TiO2 molar ratio is 0, Al reacts with TiO2 to produce fine α-Al2O3 particles and Ti, which then reacts with Al to form large rod-like Al3Ti phase. By adding graphite C into the Al-TiO2 system, the activation energy of the first reactive step increases; in addition, the resultant Ti preferentially reacts with C to form hard TiC particles. When the C/TiO2 molar ratio increases to 1.0, the Al3Ti phase disappears and the reinforcements consist of nano-sized α-Al2O3 and TiC phases. The tensile strength of the composites increases from 239.2 MPa to 351.8 MPa and the elongation increases from 4.1% to 5.6%, suggesting a marked increase in damage tolerance (i.e., toughness). © 2012 Elsevier B.V. All rights reserved. |
Keywords: | Composite materials Chemical synthesis Differential scanning calorimetry (DSC) Mechanical properties |
Rights: | © 2012 Elsevier B.V. All rights reserved. |
DOI: | 10.1016/j.matchemphys.2012.09.052 |
Published version: | http://dx.doi.org/10.1016/j.matchemphys.2012.09.052 |
Appears in Collections: | Aurora harvest Materials Research Group publications Mechanical Engineering publications |
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